On Wed, 2006-01-18 at 15:33 -0500, FM wrote:
> Hello everybody,
>
> Is redhat cluster suite (RHEL 4 ) a good candidate for a webfarm ?
> My setup would be : several servers (1U AMd dual core) connected to
> iscsi storage array.
Is this your expected configuration?
server server server
| | |
+----------+----------+ <-- cool gigabit ethernet backbone
|
GFS
|
iSCSI target doing RAID internally
|
disks
You can also do the following to avoid GFS, if your NAS has iSCSI target
has NFS capabilities:
server server server
| | |
+----------+----------+ <-- cool gigabit ethernet backbone
|
NFS Appliance/Server
|
disks
Or, if the data doesn't change often:
server server server
^ ^ ^
+-<-<-<-<--+-->->->->-+ <-- cool gigabit ethernet backbone
^
^ <-- one-way, periodic 'push'
server of static content. Web servers
| can not write to the main server
disks
On the front-end, you can use piranha + LVS to balance traffic between
the web servers. Do *not* do the following, as the servers' caches/RAID
metadata will not necessarily be in sync with each other:
server server server
| | |
md RAID md RAID md RAID
| | |
+----+-----+-----+----+
| |
iSCSI disk iSCSI disk
-- Lon
--
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